Now that the game works for me, I stumbled upon a big bug (unless it's intended): In the castle's library, the refund for already-bought skills seems to be wonky. Lita's Multishot I costs 15 coins. If I already have it and buy it again, I get a refund of 250 coins. This is stackable, so I can puchase two at once for 500 coins and so on. It's very easy unlimited money, but kind of game-breaking.